Specifically, what I’m trying to do is create a mobile version of a site I don’t have access to. The best approach I can think of is this:
My site executes their php search file and then displays the results page, but first modifies its DOM to use my CSS. Is it technically possible?
Specifically, what I’m trying to do is create a mobile version of a site
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Your site can definitely access web content from another site, filter/transform it however it wants, and then forward the result wherever it wants. It is not a simple problem, potentially, as so much web content is dynamic. For example, if the source site has content that’s formatted with CSS that’s dynamically built by JavaScript, it’d be fairly difficult to come up with an automated transformation.
Whether the original site’s owners will be happy about your site doing that is a separate issue.